NEET Physics: Questions 366 - 370 of 2098

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Question number: 366

» Kinematics » Average Speed and Instantaneous Velocity

Assertion-Reason▾

Assertion (Ꭺ)

Rain is falling vertically downwards with velocity 6 km/h. A man walks with a velocity of 8 km/h. Relative velocity of rain w. r. t. the man is 10 km/h.

Reason (Ꭱ)

Relative velocity is the ratio of two|velocities.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

b.

Both Ꭺ and Ꭱ are false

c.

Ꭺ is true but Ꭱ is false

d.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

Question number: 367

» Rotational Motion » Angular Momentum

MCQ▾

Question

The angular momentum of a system of particles is conserved

Choices

Choice (4) Response

a.

When no external force acts upon the system

b.

When axis of rotation remains same

c.

When no external torque acts upon the system

d.

When no external impulse acts upon the system

Question number: 368

» Rotational Motion » Torque

MCQ▾

Question

A constant torque acting on a uniform circular wheel changes its angular momentum from Aq to 5Aq in 4 seconds. The magnitude of this torque is

Choices

Choice (4) Response

a.

4A0

b.

A0

c.

12A0

d.

3A04

Question number: 369

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A body of mass 0.05 kg falls from a height of 5 meter into a pile of sand. The body penetrates the sand a distance of 5 cm before stopping. What force has the sand exerted on the body?

Choices

Choice (4) Response

a.

-49 N

b.

- 19.6 N

c.

-196 N

d.

0.196 N

Question number: 370

» Electrostatics » Electric Potential

MCQ▾

Question

A proton moves a distance d in a uniform electric field if as shown in the figure. Then which of the following statements are correct?

Proton and its direction

Proton and Its Direction

A proton moves a distance d in a uniform electric field is shown in figure

  1. Electric field do a negative work on the proton
  2. Electric potential energy of the proton increases
  3. Electric field do a positive work on the proton
  4. Electric potential energy of the proton decreases

Select the correct answers and mark it according to the following codes:

Choices

Choice (4) Response

a.

1 and 2

b.

1 and 3

c.

1, 2 and 3

d.

1 and 4

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